Seismic fragility analysis of irregular bridges with non-circular tall piers considering ground motion directionality

Shan, Dayong; Qu, Faxian; Deng, Xudong

doi:10.1007/s10518-019-00769-z

Cited by 22 publications

(3 citation statements)

References 35 publications

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“…The seismic performance of a horizontally curved and skewed three-span CRFB under three-dimensional nearfault earthquakes was investigated (Wilson et al 2015). The seismic fragility and damage of the asbuilt and retrofitted old and newly designed multi-span CRFBs (Jung and Andrawes 2018;Abbasi and Moustafa 2019) and the irregular bridges with non-circular tall piers considering ground motion directionality were assessed (Shan et al 2020). The seismic fragility of the offshore (Liang et al 2020), sea-crossing (Zhang et al 2021a) and deep-water CRFBs (Zhang et al 2021b) were evaluated.…”

Section: Introductionmentioning

confidence: 99%

Seismic response characteristics and whiplash effect mechanism of continuous rigid-frame bridges subjected to near-fault ground motions

2023

Bull Earthquake Eng

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Continuous rigid-frame bridge (CRFB) is widely constructed in western China with high seismicity areas. To investigate the seismic response characteristics and whiplash effect mechanism of CRFBs under near-fault ground motions, this study selects a long-span CRFB with high piers as the prototype bridge and develops the nonlinear finite element model based on OpenSees. In this work, three groups of near-fault ground motions having forward directivity pulse, fling-step pulse and non-pulse are selected as seismic inputs. These records are intercepted using significant duration index and scaled to 0.2 g, 0.4 g, and 0.64 g, representing basic ground motions, frequent ground motions and rare ground motions, respectively. The study analyzes the seismic response characteristics of CRFBs and discusses the effects of bearing constraints, ground motion components and vertical excitations on the seismic responses. The numerical results show that the longitudinal vibration, transverse whiplash effect and vertical uplift behavior of main girder are main deformation characteristics of CRFBs. Compared with non-pulse earthquakes, the structural displacements, lateral drift angles, bearing deformations, internal forces and pounding effects all significantly increase under pulse-like earthquakes. There are spatial torsional effects in mid-span girder and main piers and pounding effects between girder ends and transition pier top. The perfectly-free and fixed bearings in transverse direction are not recommended for the seismic design of CRFBs. An optimal stiffness ratio in friction pendulum systems may exist that can minimize bending degree of the main girder. Furthermore, the side-span girder under pure longitudinal excitations can uplift that is closely  Long-He Xu

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Section: Introductionmentioning

confidence: 99%

Seismic response characteristics and whiplash effect mechanism of continuous rigid-frame bridges subjected to near-fault ground motions

2023

Bull Earthquake Eng

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“…Researchers evaluated the seismic fragility of multi-span CRFBs (Jung and Andrawes 2018;Abbasi and Moustafa 2019;Liang et al 2020;Shan et al 2020), conducted a parametric analysis of trainbridge interactions (Qiao et al 2023). Additionally, researchers have developed novel structural systems (Peng and Zhang 2020;Lin et al 2020c) and assessed the seismic response of ordinary and isolated CRFBs crossing strike-slip fault rupture zones (Ucak et al 2014;Yang et al 2021).…”

Section: Introductionmentioning

confidence: 99%

Seismic Response Characteristics and Performance Improvement of Near-Fault Continuous Rigid-Frame Bridges

2023

Preprint

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In recent years, increasing attention has focused on seismic performance of long-span continuous rigid-frame bridges (CRFBs) under near-fault earthquake excitations. To investigate the characteristics of near-fault seismic response of CRFBs and evaluate the effectiveness of a hybrid seismic control system (HSCS), this study establishes 22 uncontrolled models and 22 controlled models varying in span and pier height. A comprehensive seismic evaluation method based on a fuzzy logic control (FLC) algorithm is proposed. Transverse whiplash and spatial torsion effects of the uncontrolled and controlled models are analyzed comparatively. Control performance of HSCS is evaluated and parametric study is conducted to investigate the effect of friction, damping, and ground motion on seismic response of HSCS-controlled CRFB. The results indicate that, in practical applications, the transverse whiplash and spatial torsion effects of CRFBs should be considered, particularly in multi-span CRFBs with unequal-height piers. The span and pier height have significant impact on these two effects and the corresponding girder end displacement, girder base, and pier bottom moment. Controlled bridges exhibit lower levels of these responses compared to uncontrolled bridges, and the displacement and bending moment are markedly reduced at a high control ratio of 0.4. Parametric analysis results show that the HSCS provides excellent seismic control performance for near-fault CRFBs when the optimum parameter values are used. This study may provide a useful reference for the seismic design and performance improvement of near-fault CRFBs.

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“…For high-speed railway bridges in strong earthquake conditions, both ductility seismic and isolation seismic systems have been introduced by designers [9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25]. Kang et al [9] evaluated the seismic damage to high-speed railway bridge components under various earthquake excitation intensities.…”

Section: Introductionmentioning

confidence: 99%

Optimal Selection of Earthquake Resisting Schemes for Jakarta‐Bandung High‐Speed Railway

Quan

Lin

Liu

et al. 2022

Advances in Civil Engineering

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The Jakarta-Bandung high-speed railway is the first overseas project involving China’s high-speed railway. Owing to the high seismic intensity in this area, the optimal selection of earthquake resisting schemes is critical for short-span bridges, and such schemes are related to the safety and cost-effectiveness of the entire line. This study compares the safety and cost-effectiveness of four earthquake resisting schemes: (i) prestressed concrete (PC) simply-supported box beams using common spherical steel bearings; (ii) PC simply-supported box beams using seismic isolation bearings; (iii) steel-concrete (SC) composite simply-supported beams using seismic isolation bearings; (iv) reinforced concrete (RC) rigid frames. The results indicate that PC beams using more expensive seismic isolation bearings reduce the cost of the substructure, making it more cost-effective. In contrast, the scheme of SC composite beams is the most expensive one, and the associated maintenance costs are also the highest. Although the scheme of RC rigid frames is the cheapest among the evaluated schemes, it is only suitable for relatively stiff sites with low pier heights. Overall, PC beams with isolation bearings exhibit good seismic performance and are suitable for prefabricated construction; therefore, this scheme can be applied in various soil conditions with relatively low costs, and it is recommended for use throughout the entire Jakarta-Bandung high-speed railway.

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Seismic fragility analysis of irregular bridges with non-circular tall piers considering ground motion directionality

Cited by 22 publications

References 35 publications

Seismic response characteristics and whiplash effect mechanism of continuous rigid-frame bridges subjected to near-fault ground motions

Seismic response characteristics and whiplash effect mechanism of continuous rigid-frame bridges subjected to near-fault ground motions

Seismic Response Characteristics and Performance Improvement of Near-Fault Continuous Rigid-Frame Bridges

Optimal Selection of Earthquake Resisting Schemes for Jakarta‐Bandung High‐Speed Railway

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